JP3354992B2 - Lens meter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens meter,
More specifically, the present invention relates to a lens meter having a function of determining the type of a lens to be inspected, such as a single focus lens or a progressive lens.

[0002]

2. Description of the Related Art Conventionally, a prism value (P) of a test lens,
Various lens meters for measuring optical characteristics such as a spherical power (S), a cylindrical power (C), and an axial angle (A) have been proposed. In such a lens meter, whether a lens to be inspected is a single focus lens or not. It does not have a function of automatically determining the type of the lens to be inspected such as a progressive lens or the like, and the actual situation is that the determination of the type of the lens to be inspected relies solely on the feeling and experience of the examiner.

[0003] That is, conventionally, the examiner discriminates by the age of the spectacle frame wearer, directly listens to the spectacle frame wearer, looks at the graph paper or the scenery through the lens to be examined, Whether the test lens is a single focus lens or a progressive focus lens is determined by finding the attached hidden mark or further checking the so-called edge thickness of the test lens.

[0004]

However, in the case of the conventional discrimination method as described above, the examiner must rely solely on the feeling and experience of the examiner, and the examiner erroneously judges the single focus lens as the progressive lens. In many cases, the progressive lens is erroneously determined to be a single focus lens, and the measurement efficiency of the lens to be measured is reduced, resulting in a decrease in serviceability to customers.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a lens meter which can automatically determine the type of a lens to be inspected simply by placing the lens to be inspected on a lens receiver and performing a simple operation.

[0006]

According to the first aspect of the present invention,
In a lens meter that obtains the optical characteristics of the test lens based on the measurement light beam transmitted through the test lens mounted on the lens receiver, each measurement site of the test lens that can move planarly on the lens receiver is determined. Characteristic calculating means for calculating the optical characteristics of each measurement site based on each transmitted measurement light beam , storage means for storing the optical characteristics of each measurement site calculated by the characteristic calculation means, a display unit, and storage in the storage means in and comparing the optical properties of the measurement site was, they almost change the type of the subject lens by whether or not there is single-vision lens or progressive multifocal lens optical characteristics with respect to the prism value or the moving distance of each measurement site have a discriminating means for discriminating whether the target Kenre
Lens is determined to be a progressive lens,
At least the pattern indicating the progressive zone, the distance vision and the measurement site
The pattern shown is automatically displayed on the display unit .

According to a second aspect of the present invention, there is provided a lens meter for determining an optical characteristic of a lens to be measured based on a measurement light beam transmitted through the lens to be mounted on the lens holder. A light receiving means for receiving the measurement light beam transmitted through the measurement site of the lens, and a plurality of measurement sites of the lens to be measured.
Characteristic calculating means for calculating the optical characteristics of each area obtained from the light receiving means by dividing the light into light, storing means for storing the optical characteristics of each area of the measurement site calculated by the characteristic calculating means, a display unit, and storage. comparing the optical characteristics of each region stored in the unit, the progressive focal or substantially change the type of the subject lens by whether or not there is a single focus lens with respect to their optical characteristics prism value or the moving distance of each measurement site have a discriminating means for discriminating whether the lens, the subject lens is zoned
If it is determined that the lens is a progressive lens, at least
Pattern indicating the advancement and distance vision and pattern indicating the measurement site
Is automatically displayed on the display unit .

[0008]

[0009]

The operation of each invention having the above-described configuration will be described.

In the lens meter according to the present invention, when the test lens is placed on the lens receiver and the measurement light beam is transmitted through each measurement site, the characteristic calculating means calculates the measurement light beam transmitted through each measurement site. The optical characteristics of each measurement site are calculated based on the above, and sent to the storage means to be stored and held.

The discriminating means compares the optical characteristics of each measurement site stored in the storage means and discriminates the type of the lens to be inspected, that is, the type of a single focus lens, a progressive lens or the like.

As a result, the type of the lens to be inspected can be changed to a single focal length lens simply by placing the lens to be inspected on the lens receiver and performing a simple operation.
Lens or progressive lens, and
If the lens is determined to be a progressive lens,
"Progressive focus lens" where patterns such as progressive zones are displayed dynamically
Measurement mode.
It is easy to grasp the progressive zone of the
Quickly determine the distance and measure the optical properties of the distance and near parts
it can. In addition, the "progressive focus lens measurement mode"
Switching is performed for the corridor of the lens to be inspected, the distance section, and the lens.
Each pattern indicating the measurement site on the receiver should be displayed on the display.
By this, the examiner can recognize. Therefore, the test
This eliminates erroneous lens identification, improves measurement efficiency, and improves serviceability to customers.

In the lens meter according to the present invention, when the test lens is placed on the lens receiver and the measurement light beam is transmitted through the measurement site, the measurement light beam is received by the light receiving means. The means sends the output signal to the characteristic calculating means.

[0014] The characteristic calculating means determines a measurement site of the lens to be measured.
Each area obtained from the light receiving means by being divided into a plurality of areas
The optical characteristics are calculated, and the calculation result of each area is sent to the storage unit and stored.

The discrimination means compares the optical characteristics of each area stored in the storage means and discriminates the type of the lens to be inspected, that is, the type of a single focus lens, a progressive lens or the like.

As described above, a plurality of measurement sites of the lens to be inspected are provided.
Divide into regions and compare the optical characteristics calculated in each region
Do not move the test lens placed on the lens receiver.
At least, the type of the lens to be inspected can be automatically determined, and the measurement efficiency is improved . In addition, the subject
Lens type is either a single focus lens or a progressive lens.
The lens to be inspected is a progressive lens.
When it is separated, a pattern such as a corridor is automatically displayed.
Switch to "Progressive lens measurement mode"
Easy to grasp the progressive zone of the lens to be inspected and the distance vision part
And the optical characteristics of the near and near parts
Gender measurements can be performed quickly. Further, the progressive focus lens
Switching to the lens measurement mode is based on the progressive
Each pattern indicating the measurement area on the band, distance section and lens receiver
Is displayed on the display so that the examiner can recognize it.
it can. Therefore, erroneous determination of the test lens is eliminated, the measurement efficiency is further improved, and the serviceability to the customer is also improved.

[0017]

[0018]

[0019]

[0020]

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail.

The lens meter 1 shown in FIG. 1 has a box-shaped housing 2 and a lens receiver 3 disposed on the front surface of the housing 2, and has a light receiving means 12 such as a CCD area sensor disposed therein. The lens holder 4 and the lens holder 3 are disposed above the lens holder 3.
A light source holder 5 having a built-in measurement light source 11, a lens L holding unit 6 for holding a test lens L mounted on the lens receiver 3 from above, and an LC arranged above the light source holder 5.
A display unit 7 such as a D display, input means 14 including a measurement start switch, an addition switch, an operation direction instruction key (arrow key), and the like disposed at a lower part of the front surface of the housing 2; And a paper discharge port 8 disposed at the bottom.

FIG. 2 shows a control system of the lens meter 1. The control system 20 includes a control unit 21 for performing overall control and a program memory 22 storing a control program. Measurement light source 11
Of the light receiving means 12
Signal processing unit 13, which takes in the output signal of
The input means 14 for giving a measurement start instruction and the like, the display control section 19 for controlling the display of the display section 7, the printer 15 facing the paper discharge port 8, and the speaker 16 are connected.

The display section 7 and the display control section 19 constitute display means 25.

Further, the control unit 21 sends the lens to be inspected to each of the measurement sites or each of the four divided regions, for example, based on the output signal corresponding to the amount of light received by the light receiving means 12. A characteristic calculator 23 for calculating optical characteristics of L, that is, optical characteristics such as a prism value (P), a spherical power (S), a cylindrical power (C), and an axial angle (A) of the lens L to be measured;
Storage means 1 for storing the calculation result of this characteristic calculation means 23
8 and the lens L to be inspected based on the information stored in the storage means 18.
Is connected to a discriminating means 17 for discriminating a type such as a single focus lens or a progressive lens.

Next, the operation of the lens meter 1 will be described.

As shown in FIG. 3, the operating directions on the lens L to be inspected on the lens receiver 3 are X1, X2 directions corresponding to the left and right directions of the eye when worn as spectacles. The following description is made with the directions corresponding to the up-down direction as Y1 and Y2 directions.

When the lens L to be measured is placed on the lens receiver 3 and the lens L to be measured is moved in the X1, X2 and Y1 and Y2 directions, and the measurement light beam is transmitted through each measurement site, the light is received. The means 12 sends an output signal corresponding to each measurement site of the test lens L to the signal processing unit 13. These output signals are subjected to signal processing by the signal processing unit 13, and then sent to the characteristic calculating unit 23 under the control of the control unit 21, whereby the characteristic calculating unit 23 calculates the optical characteristics of each measurement site. , Storage means 18
To be stored.

The discriminating means 17 compares the optical characteristics of each measurement site stored in the storage means 18 and determines
, Ie, the type of single focus lens, progressive lens, etc.

That is, if the lens L to be inspected is a single focus lens, the lens L to be inspected has prism values (PX) and (PY) in the X1, X2 and Y1, Y2 directions, a spherical power (S), The relationship between the cylindrical power (C) and the shaft angle (A) is constant as shown in FIGS.

As a result, it is possible to automatically determine that the test lens L is a single focus lens simply by placing the test lens L on the lens receiver 3 and performing a simple moving operation. There is no difference, measurement efficiency is improved, and serviceability to customers is also improved.

The horizontal axis in FIGS. 4 and 5 is the prism value (PX
), (PY) instead of the corresponding X (m
m) and Y (mm).

As shown in FIG. 6, the output signal from the light receiving means 12 based on the measurement light flux transmitted through the measurement site by the characteristic calculation means 23 is divided into, for example, four to obtain each area α _1.
To α ₄ are calculated and stored by the storage means 18, and each area α _{1 is} determined by the determination means 17.
Or alpha ₄ types by comparing the optical characteristics such subject lens L, that can be discriminated monofocal lenses, the type of such progressive power lens.

Alternatively, optical characteristics calculated by a combination of selecting three regions from the divided regions α _{1 to} α ₄ may be compared. In this manner, the determination can be made without moving the test lens L. In recent years, progressive lenses are effective in many cases where the position of the optical center is in the progressive zone due to prism sealing.

According to the above-described method, it is possible to automatically determine the type of the lens L to be inspected simply by placing the lens L on the lens holder 3, so that the measuring efficiency is further improved, and The serviceability with respect to is also improved.

Next, the discriminating operation when the lens L to be inspected is a progressive lens will be described in detail with reference to FIGS.

When the lens L to be inspected is placed on the lens receiver 3, the distance portion in the X1 and X2 directions has a prism value (P) of 0, so that the light of the measurement light beam of the lens meter 1 is light. What is necessary is just to make the position of Px = 0 of the test lens coincide with the axis.

The distance portion in the Y1 and Y2 directions has a prism value (P) for a progressive lens in order to reduce the edge thickness.
Is often performed, and the position of the prism value Py = 0 is not always a distance portion.

Therefore, it is necessary to specify the distance portion and measure it by the following operation.

When it is determined that the test lens L or the test lens L that is known to be a progressive lens is a progressive lens, the progressive focus lens is operated by an input operation from the input means 14 or automatically. The mode is switched to the lens measurement mode, and the display on the display unit 7 is as shown in FIG. 9 or FIG.

That is, when the test lens L is placed on the lens receiver 3, it is difficult to determine whether the measurement site of the test lens L is a distance portion or a progressive portion by itself.
As shown in FIG. 9 or FIG. 10, the display control unit 19 controlled by the control unit 21 causes the display unit 7 to display a pattern indicating a progressive zone and a measurement site that induce the movement of the test lens L in the Y1 direction. (A cross line) and a pattern (を in the figure) indicating a distance portion.

Here, the examiner moves the test lens L in the Y1 direction so that the pattern indicating the measurement site matches the pattern indicating the distance portion.

At this time, the prism values (PX) before and after the movement of the test lens L calculated by the characteristic calculating means 23,
(PY), the spherical power (S), the cylindrical power (C), and the axial angle (A) are stored in the storage means 18 and compared by the determination means 17. That is, as shown in FIG.
A portion where the spherical power (S) does not change with movement in one direction is a distance portion. Further, if the spherical power (S) changes before and after the movement, it is determined that the measurement site is a progressive portion.

At this time, a display shown in FIG. 10, which induces the movement of the lens L in the Y2 direction as if the lens L has been moved too much in the Y1 direction, is displayed on the display unit 7.

The examiner moves the test lens L in the Y2 direction so that the pattern indicating the measurement site matches the pattern indicating the distance portion. At this time, the point at which the S value starts decreasing or does not change compared to before the movement substantially coincides with the somewhat center of the test lens L set by the manufacturer.

That is, first, the display shown in FIG. 9 is performed and the lens L to be inspected is moved in the Y1 direction as shown in FIG. Here, while the refractive power of the test lens L is constant, the display shown in FIG. 9 is continued to further induce the movement in the Y1 direction. When the refractive power of the test lens L starts to increase along with the movement in the Y1 direction, the display shown in FIG. 10 is displayed to return the test lens L in the Y2 direction, and the display is performed during the movement in the Y1 direction. The point at which the refractive power starts to change or the point at which the refractive power starts to be constant during the movement in the Y2 direction substantially coincides with the center of the lens L to be measured set by the manufacturer.

Since this position is 5 to 6 mm below the distance measuring position set by the manufacturer, the display shown in FIG. 9 is displayed on the display unit 7 again, and the lens L to be measured is moved in the Y1 direction. At this time, if the spherical power (S) and the prism value (Py) of the lens L to be measured at the center position are stored, then if the distance to move the lens L is Y, ΔPy = Y ·
It is sufficient that the prism value (Py) is moved in the Y1 direction from S / 10 to a position where the prism value (Py) changes by .DELTA.Py. In this state, a display indicating a match is made, and the spherical power (S), the cylindrical power (C), the axis The angle (A) may be automatically stored in the storage unit 18 as the distance power, or may be stored in the storage unit 18 by operating the input unit 14.

Thereafter, the display on the display unit 7 changes to the near search (progressive search) mode, and the examiner changes only the spherical power (S) as compared with the value of the distance power, and the cylindrical power (C). , The portion where the axial angle (A) does not change is traced and the lens L
Can be moved, and during movement, the spherical power of the distance portion (S)
The difference (addition) of the spherical power (S) is displayed on the display unit 7, and the point at which the difference becomes the maximum is displayed as the near portion of the lens L to be inspected, so that the near position is obtained. Part can be specified.

The prism values (Px) of the progressive lens in the X1 and X2 directions, the spherical power (S), the cylindrical power (C),
As shown in FIG. 7, the relationship with the axial angle (A) is such that the spherical power (S) is indefinite except for the corridor, the cylindrical power (C) increases on both sides of the corridor, and the axial angle (A) Is undefined except for the corridor.

The horizontal axis in FIGS. 7 and 8 is the prism value (Px
), (PY) instead of the corresponding X (m
m) and Y (mm).

The present invention is not limited to the embodiment described above, and various modifications can be made within the scope of the invention.

[0052]

According to the present invention, which has been described in detail above, the following effects can be obtained because of the above-described configuration.

According to the first aspect of the present invention, the type of the lens to be inspected is determined simply by placing the lens to be inspected on the lens receiver and performing a simple operation, and the lens to be inspected is a progressive lens.
Is automatically determined, the pattern of the corridor etc. is automatically
Switch to the displayed “Progressive focus lens measurement mode”
Since the measurement is performed, the progressive zone of the lens to be inspected and
It becomes easy and the near part can be fixed and the light of the far and near parts can be
To provide a lens meter that can quickly measure optical characteristics
Can be In addition, the “progressive focus lens measurement mode” is used.
Switching to `` de '' means that the lens to be inspected is
Each pattern indicating the measurement site on the lens receiver is displayed on the display.
By showing, the examiner can recognize. Follow
As a result, the erroneous determination of the test lens is eliminated, the measurement efficiency is improved, and the serviceability to the customer is also improved.

According to the second aspect of the present invention, the lens to be inspected
Is divided into multiple regions, and the light calculated in each region
Because the characteristics are compared, the test
Even if the lens is not moved, the type of the lens to be inspected can be automatically determined, and the measurement efficiency is improved .
Whether the type of the lens under test is a single focus lens or not
Determines whether the lens is a progressive lens and the lens to be inspected
If it is determined that the lens is
"Progressive focus lens measurement mode" that displays the pattern of
The measurement is switched to
In addition to making it easy to grasp the part,
Lens that can quickly measure the optical characteristics of the main and near parts
A meter can be provided. In addition, the "progressive focus"
Switching to the “point lens measurement mode”
Each pattern indicating the measuring zone on the progressive zone, the distance section and the lens receiver
The examiner recognizes by displaying the
Can be. Therefore, erroneous determination of the lens to be inspected is eliminated,
Measurement efficiency is further improved, and serviceability to customers is also improved.

[0055]

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a lens meter according to the present invention.

FIG. 2 is a block diagram showing a control system of the lens meter according to the embodiment.

FIG. 3 is an explanatory diagram showing a moving direction of a test lens in the lens meter of the present embodiment.

FIG. 4 shows a prism value in the X direction of a single focus lens in the lens meter of the present embodiment, and spherical power, cylindrical power,
Characteristic diagram showing the relationship with the shaft angle

FIG. 5 shows a prism value in the Y direction of a single focus lens in the lens meter of the present embodiment, and spherical power, cylindrical power,
Characteristic diagram showing the relationship with the shaft angle

FIG. 6 is an explanatory diagram showing each area obtained by dividing a measurement site in the lens meter of the present embodiment.

FIG. 7 is a characteristic diagram showing the relationship between the prism value in the X direction of the progressive lens in the lens meter of the present embodiment and the spherical power, the cylindrical power, and the axial angle.

FIG. 8 is a characteristic diagram showing the relationship between the prism value in the Y direction of the progressive lens in the lens meter of the present embodiment, and the spherical power, the cylindrical power, and the axial angle.

FIG. 9 is an explanatory diagram showing a display example of a progressive lens in the lens meter of the present embodiment.

FIG. 10 is an explanatory diagram showing another example of the display example of the progressive lens in the lens meter of the present embodiment.

FIG. 11 is an explanatory diagram illustrating a moving direction of a progressive lens in the lens meter according to the present embodiment.

[Explanation of symbols]

 Reference Signs List 1 lens meter 12 light receiving means 17 discriminating means 18 storage means 23 characteristic calculating means 25 display means L lens to be inspected

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-3-156338 (JP, A) JP-A-2-210238 (JP, A) JP-A-4-248433 (JP, A) JP-A-5-248 340842 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) G01M 11/00-11/02 G02C ⁷ /00-7/02 G01B 11/00-11/30 102

Claims (2)

(57) [Claims] 1. A lens meter for obtaining an optical characteristic of a test lens based on a measurement light beam transmitted through a test lens mounted on the lens receiver .
Characteristic calculation means for calculating the optical characteristics of each measurement site based on each measurement light flux transmitted through each measurement site of the possible test lens,
Storage means for storing optical characteristic of each measurement site, which is calculated by the characteristic calculation unit, a display unit, by comparing the optical characteristics of the measurement site stored in the storage unit, they optical properties prism values of each measurement site or Determining means for determining whether the type of the test lens is a single focus lens or a progressive lens based on whether there is substantially no change with respect to the movement distance.
And it is determined that the test lens is a progressive lens.
At least a pattern indicating the progressive zone,
And the pattern indicating the measurement site are automatically displayed on the display.
Lens meter, characterized in that indicated. 2. A lens meter for determining the optical characteristics of a test lens based on a measurement light beam transmitted through a test lens mounted on the lens receiver, wherein the light passes through a measurement site of the test lens on the lens receiver. Light receiving means for receiving the measured measurement light beam;
The measurement site of the test lens is divided into a plurality of
Characteristic calculating means for calculating the optical characteristics of each region obtained from the step, storage means for storing the optical characteristics of each region of the measurement site calculated by the characteristic calculating means, a display unit, and each region stored in the storage means of comparing the optical properties, determine the type of those the subject lens by whether almost no change in the optical properties prism value or the moving distance of each measurement site is a single-focus lens or progressive lens have a determining means for, when the subject lens is a progressive lens
If it is judged, at least the progressive zone and the distance
The pattern indicating the turn and the measurement site is automatically displayed on the display.
A lens meter that is dynamically displayed .